As the most studied and widely used chiral ligands, C7H5ClO have been rapidly developed in recent decades due to their simple synthesis, easy modification, and the ability to achieve excellent results in multiple reactions. Formula: https://www.ambeed.com/products/104-88-1.html.
A facile transformation of 1-formyl beta-carboline into fluorescent beta-carboline C-1 tethered benzazole derivatives is described under the catalysis of ZnO nanoparticles. The reaction proceeded with the reaction of 1-formyl beta-carboline and substituted o-diaminobenzene/2-aminobenzenethiol/2-aminophenol, which results in formation of a Schiff base, followed by an intramolecular cylization reaction to generate beta-carboline linked benzimidazole, benzothiazole and benzoxazole derivatives. This appraoch displayed a wide substrate scope and high regioselectivity to yield the desired products in moderate to good yields. The photophysical properties of the synthesized derivatives were also evaluated and they exhibited excellent fluorescence properties. Among these beta-carboline substituted azoles, the benzothiazole derivative displayed the maximum quantum yield (phi(F) up to 28%).
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Reference:
Benzoxazole – Wikipedia,
,Benzoxazole | C7H5NO – PubChem